A portion of the west rim of Endeavour crater sweeps southward in this color view from NASA’s Mars Exploration Rover Opportunity.

This image, cropped from a larger panoramic image mosaic taken by the Mars Exploration Rover Spirit panoramic camera shows the rover’s destination toward the hills nicknamed the Columbia Hills. REUTERS/NASA/JPLCornell/USGS

Echus Chasma is an approximately 100 km long and 10 km wide incision in the Lunae Planum high plateau north of Valles Marineris, the Grand Canyon of Mars. Images taken by ESA’s Mars Express of Echus Chasma.

An iron meteorite on Mars in an image taken by the Mars Exploration Rover Opportunity.

An impact crater on Mars is seen in an image taken by Orbiter.

A view of the Noctis Labyrinthus region of Mars, perched high on the Tharsis rise in the upper reaches of the Valles Marineris canyon system.

Two trenches dug by Phoenix’s Robotic Arm.

Mars’ Victoria Crater at Meridiani Planum.

A location on Mars associated with the best-selling novel and Hollywood movie, “The Martian” This area is in the Acidalia Planitia region and in the novel and the movie, it is the landing site of a crewed mission named Ares 3. REUTERS/NASA/JPL-Caltech/Univ. of Arizona

The northern-most sand dunes are seen as they begin to emerge from their winter cover of seasonal carbon dioxide (dry) ice.

Part of the wall of Gale Crater. Here, a network of valleys believed to have formed by water erosion enters Gale Crater from the outside.

Portions of the Martian surface showing many channels from 1 meter to 10 meters wide on a scarp in the Hellas impact basin.

Curiosity appears as a bluish dot near the lower right corner of this enhanced-color view from Orbiter taken June 2013.

The surface of the planet Mars inside Gale Crater.

Nili Patera, one of the most active dune fields on the planet Mars.

A view of Ophir Chasma on the northern portion of the vast Mars canyon system, Vallles Marineris, taken by NASA’s Mars Reconnaissance Orbiter.